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Interest and Finance Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Borrowing costs [abstract]    
Interest expense $ 9,216 $ 16,879
Finance fees 2,628 2,500
Accretion expense (Note 17) 8,260 9,903
Interest and finance expense $ 20,104 $ 29,282